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Assignment of indirect 13C, 1H couplings in the 13C NMR spectra of some purine and pyrimidine nucleosides and their analogues by long-range selective 1H decoupling

✍ Scribed by Jun Uzawa; Masakazu Uramoto

Publisher
John Wiley and Sons
Year
1979
Tongue
English
Weight
330 KB
Volume
12
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The assignments of the long‐range ^13^C, ^1^H coupling constants in the ^13^C NMR spectra of the base moieties of several purine and pyrimidine nucleosides and their analogues were established by the application of long‐range selective ^1^H decoupling with low‐power ^1^H irradiation. The ^3^J values between the carbons and protons of the pyrimidine ring in these compounds were larger than the ^2^J values. The conformational preference of these nucleosides in solution was shown to be predominantly anti from the value of the vicinal ^13^C, ^1^H coupling constants between H‐1′ and the base carbons through the glycosidic bond.

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